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    <title>International Journal of Physics</title>
    <link>http://www.sciepub.com/journal/IJP</link>
    <description>International Journal of Physics is a peer-reviewed, open access journal that publishes original research articles and review articles in all areas of physics. The goal of this journal is to provide a platform for scientists and academicians all over the world to promote, share, and discuss various new issues and developments in different areas of physics.</description>
    <dc:publisher>Science and Education Publishing</dc:publisher>
		<dc:language>en</dc:language>
		<dc:rights>2013 Science and Education Publishing Co. Ltd All rights reserved.</dc:rights>
		<prism:publicationName>International Journal of Physics</prism:publicationName>
		14
		2
		January 2026
		<prism:copyright>2013 Science and Education Publishing Co. Ltd All rights reserved.</prism:copyright>
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<title>
A Fast-Orbiting Star as a Probe of Relativistic Dynamics Near the Galactic Center
</title>
<link>http://pubs.sciepub.com/ijp/14/2/1</link>
<description>
<![CDATA[The star S4716 is one of the fastest known members of the Galactic-center S-star cluster orbiting the supermassive black hole Sagittarius A*. With an orbital period of approximately four years and velocities approaching 2.6% of the speed of light near pericenter, the star provides an important probe of stellar dynamics in the strong gravitational field of the Galactic center. In this work the orbital architecture of S4716 is analyzed within the Primary-Centric Framework (PCF), in which characteristic orbital states are determined by the triple synchrony condition where the spin angular velocity of the primary, the spin angular velocity of the secondary, and the orbital angular velocity of the secondary become equal. This condition defines the synchrony radii aG1 and aG2 that characterize the dynamical topology of the system. For the extreme mass-ratio configuration of the S4716–Sagittarius A* system, the inner synchrony radius aG1 remains finite and dynamically accessible, while the outer synchrony radius aG2 shifts to very large distances and becomes effectively intangible. The observed semi-major axis of S4716 is found to be consistent with the tangible synchrony scale aG1 predicted by the PCF, and the tangential velocity derived from Keplerian dynamics reproduces the observed extreme velocity of the star near pericenter. The analysis further shows that gravitational radiation from the system is negligible because of the extreme mass ratio between the stellar mass and the central black hole, so that the orbital evolution is governed primarily by gravitational dynamics. These results indicate that the orbit of S4716 lies within the constraints imposed by the Primary-Centric Framework and provide an illustrative example of stellar dynamics in the vicinity of a supermassive black hole.]]>
</description>
<dc:creator>
Bijay  K. Sharma
</dc:creator>
<dc:date>2026-03-25</dc:date>
<dc:publisher>Science and Education Publishing</dc:publisher>
<prism:publicationDate>2026-03-25</prism:publicationDate>
<prism:number>2</prism:number>
<prism:volume>14</prism:volume>
<prism:startingPage>21</prism:startingPage>
<prism:endingPage>27</prism:endingPage>
<prism:doi>10.12691/ijp-14-2-1</prism:doi>
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<item rdf:about="http://pubs.sciepub.com/ijp/14/2/2">
<title>
Spin-Electromagnetics and Spin-Gravity
</title>
<link>http://pubs.sciepub.com/ijp/14/2/2</link>
<description>
<![CDATA[The spin of electrons is studied (Spintronics) and applied to, for example, quantum computing. In this article, utilizing UMFT (Universal Mathematical Field Theory), we establish both Spin-Electromagnetics (Spin-EM) from the Coulomb’s law and the spin of electric source, and Spin-gravity from the Newton’s law and the spin of the gravity-g-charge (mass). Spin-EM predicts several new effects including the Spin-Lorentz-type force, and Spin-Lagrangian-Lorentz-type force. When experimentally confirmed, the Spin-force would be a NEW FORCE. The UMFT has been established and utilized to derive the Maxwell electromagnetics (Maxwell-EM) and Maxwell-type gravity (Gravito-EM). UMFT shows that mathematical identities lead to physical dualities, such as the duality between Maxwell-EM, Gravito-EM, Spin-EM, and Spin-gravity. The well-known-concepts, effects, and phenomena of Maxwell-EM may be directly converted to that of Spin-EM and Spin-Gravity. The Maxwell-EM, Gravito-EM, Spin-EM, and Spin-gravity are all derived from UMFT and thus, they are dual to each other, and can be unified in the frame of UMFT.]]>
</description>
<dc:creator>
Hui  Peng
</dc:creator>
<dc:date>2026-03-30</dc:date>
<dc:publisher>Science and Education Publishing</dc:publisher>
<prism:publicationDate>2026-03-30</prism:publicationDate>
<prism:number>2</prism:number>
<prism:volume>14</prism:volume>
<prism:startingPage>28</prism:startingPage>
<prism:endingPage>35</prism:endingPage>
<prism:doi>10.12691/ijp-14-2-2</prism:doi>
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